AI Briefing — Tuesday, July 21, 2026

Gemini last models: temperature, top_p, and top_k are deprecated and ignored

"Drawing" the Mona Lisa with GPT-5.6, Claude, Gemini, and Grok

OpenAI says Hugging Face was breached by its own pre-release models

OpenAI has come forward to claim responsibility for the Hugging Face breach, saying it was the result of internal testing gone awry.

OpenAI and Hugging Face address security incident during model evaluation

https://www.axios.com/2026/07/21/openai-says-hugging-face-br... See also Security incident disclosure – July 2026 - https://news.ycombinator.com/item?id=48956248 (9 comments)

The State of Simulation for Physical AI: An Overview

Jack Dorsey is taking on Slack with Buzz, a group chat platform for teams and their AI agents

Buzz is a group chat platform for the workplace that puts humans and their AI agents in the same conversation.

AI and the rise of the universal entertainment app

Over the past decade, streaming platforms competed by dominating individual formats like music, video, podcasts, or audiobooks. Now, as AI makes it easier to create, organize, and recommend content, those distinctions a…

Show HN: A self-running space economy SIM in Rust and Bevy

I built this with Claude cause I always wanted to tinker with a simulation economoy and I love space themes. A space-economy sim where nothing is scripted. A few hundred autonomous ships each run the…

Jack Dorsey launches Buzz to combine team chat, AI agents and Git hosting

https://x.com/jack/status/2079605800998146171 , https://xcancel.com/jack/status/2079605800998146171 https://buzz.xyz/

Google releases three new Gemini models — but no 3.5 Pro

Google released Gemini 3.6 Flash, 3.5 Flash-Lite, and Flash Cyber, but the continued absence of Gemini 3.5 Pro raises fresh questions about its AI strategy.

The State of Simulation for Physical AI: An Overview

Grabette: an open system to record robot-manipulation data

Newer Models, Same Advantage

Security incident disclosure — July 2026

What building Shippy taught us about building agents

The Many Senses of Visual Similarity: A Text-Prompted Image Perceptual Metric

Human visual similarity judgments are context-dependent. For example, two images may be similar in shape but distinct in color. Existing perceptual similarity metrics, however, collapse these nuances into a single scala…